2IO CONNECTICUT GEOL. AND NAT. I-IIST. SURVEY. [BuU. First antenna widely separated at the base, with the first joint short and stout; second longer and tapering; third about as long as first; flagellum longer than peduncle, tapering, five-jointed. Second antenna as long as first pair; first two joints short and stout; the next three joints more slender; flagellum of three or four joints. First thoracic segment longest; next three a little shorter and equal; fifth and sixth still shorter; and seventh the shortest. Coxal plates narrow and obtusely pointed behind, but not ex¬ tending beyond the posterior angle of their respective segments except in the last two. First pair of legs short and stout; suc¬ ceeding legs increasing in length posteriorly. Abdomen tapering rapidly at the sides; first five segments subequal in length; last segment as long as five preceding seg¬ ments, flat and broadly rounded behind. Uropods surpassing telson, with basal segment as long as rami and only slightly produced at inner angle; outer ramus linear oblong, rounded at end, inner ramus shorter and broader, oblique at the tip. Length 17-22 mm., breadth 10-12 mm. Distribution.: Mobile, Alabama; Biloxi, Mississippi; Florida; Charleston, South Carolina; Virginia; Baltimore, Maryland; New York; Long Island; New Haven, Thimble Islands, Connecticut; Woods Hole, Massachusetts; Vineyard Sound. This species is parasitic on the blue fish, saw fish, scup, sea trout, sun fish, etc. It is attached usually to the gills and roof of the mouth. LIMNORIIDA. Body subdepressed and capable of being rolled into a ball. Head short and very convex. Antenna small, subequal in size. Mouth parts normal, adapted for biting. Coxal plates behind the first segment of thorax distinct and laminar. Legs of uniform structure, ambulatory in function. Abdomen composed of six well defined segments, the last of which is very large and shield-shaped. Uropods comparatively small, lateral; rami not lamelliform.